MIL-DTL-23581B(SH)
4.4.2 Sampling for visual and mechanical examination. A random sample of machines shall be selected in
accordance with table II and examined in accordance with table I. If one or more major defects are found in any
sample, the entire lot shall be rejected. The contractor has the option of screening the lot 100 percent for the
defective characteristic(s) or providing a new lot which shall be inspected in accordance with the sampling plan
contained herein.
Table II. Sampling for visual and mechanical examination and operational tests.
Lot Size
Sample Size
2 to 8
All
9 to 90
8
91 to 150
12
151 to 280
19
281 to 500
21
501 to 1200
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4.4.3 Sampling for operational tests. A random sample of machines shall be selected in accordance with table
II and tested in accordance with 4.4.3.1 and 4.4.3.2. If any machine fails any of the tests specified in 4.4.3.1 or
4.4.3.2, the entire lot shall be rejected. The contractor has the option of screening the lot 100 percent for the
defective characteristic(s) or providing a new lot which shall be inspected in accordance with the sampling plan
contained herein. The contractor shall maintain all records of inspections, tests, and any resulting rejections for a
period of three years after contract completion.
4.4.3.1 Operational testing. Each tumbler shall be connected to power and operationally tested without
garments or laundry. The following items and operations shall be checked:
a. Manual selection of temperatures in accordance with requirements of 3.6.14.3.1 shall be verified by
conducting tests at the minimum setting, maximum setting, and 4 randomly selected settings between the maximum
and minimum temperature settings. Verification of temperature compliance at each of the six test settings shall be
by visually observing the temperature display and indicator light to determine that the set point temperature is
attained and that the heating elements are not energized above the set point temperature. The temperature setting,
maximum display temperature observed during the test, and whether the heating elements were energized above the
set point temperature shall be recorded for each test.
b. Selection of drying times in accordance with requirements of 3.6.14.3.2 shall be verified by conducting
tests at the minimum setting, maximum setting, and 4 randomly selected settings between the maximum and
minimum timer settings. Verification of timer compliance at each of the six test settings shall be checked using a
stopwatch to measure the time between the start and stop of the drying tumbler. The timer setting and the actual run
time shall be recorded for each test.
4.4.3.2 Insulation testing. Insulation resistance testing shall be conducted on each machine. Insulation
resistance of motor, controller, and connecting cable shall be measured by a 500-volt direct current insulation
resistance tester. Insulation resistance for each component shall be not less than 10 megohms. Failure to pass the
insulation resistance test is cause for rejection of the entire lot.
4.5 Inspection of packaging. Sample packages and packs, and the inspection of the preservation, packing and
marking for shipment and storage shall be in accordance with the requirements of section 5 and the documents
specified therein.
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